双线盾构施工引起的土体变形和建筑物沉降研究
发布时间：2018-11-05 20:51
【摘要】：在地下空间的建设中,盾构法是一种不可或缺的施工方法,应用相当广泛。盾构法施工虽然对上覆土层的扰动比较小,但是仍然不可避免地对周围土体产生扰动,进而引起土体变形,导致一系列的环境工程问题。本文采用理论分析法与实测分析法对盾构掘进引起的土体变形以及建筑物沉降计算方法进行了研究。本文主要创新工作如下:(1)盾构隧道施工引起的土体变形方面,主要包括:1)对盾构法隧道统一土体移动模型二维解公式进行修正,利用修正公式预测近距离双线平行盾构施工引起的总的地面沉降。该方法适用于双线隧道近距离工况,因此对近距离的界定公式进行了研究。2)考虑多因素(土体损失、正面附加推力、盾壳摩擦力、附加注浆力)的作用下,建立力学计算模型,对双线水平平行盾构施工引起的土体变形计算方法进行研究。由于后行隧道沉降槽偏移量b值可以反映先行隧道开挖对后行隧道施工的影响,对5例21个实测数据的统计结果进行分析,并对b值取值进行了研究。(2)盾构隧道施工引起的建筑物沉降方面,主要包括:1)盾构施工穿越上部既有建筑物时,形成的沉降槽与无建筑物时存在明显差异。本文采用盾构法隧道统一土体移动模型解,考虑建筑物基础刚度、基础埋深及后行隧道施工引起的土体沉降曲线不对称,对欧阳文彪解进行了修正,并将二维解拓展到了三维解。同时,对建筑物的工后沉降进行了计算。2)假定建筑物为弹性地基梁,提出一种考虑建筑物刚度对建筑物沉降影响条件下,对建筑物沉降曲线进行预测的实用方法。根据统一土体移动模型解计算出不考虑建筑物情况下盾构施工引起的地面沉降,然后根据弹性地基梁理论将该地面沉降转换为作用在弹性地基梁上的沉降反力。通过MIDAS-GEN有限元软件,将该沉降反力施加于弹性地基梁上,最后计算出考虑建筑物刚度情况下建筑物的沉降值。通过3个工程实例对本文方法进行验证,同时根据算例对隧道与建筑物位置相对关系、基床系数k值以及建筑物刚度EI对建筑物沉降的影响进行了分析。
[Abstract]:In the construction of underground space, shield method is an indispensable construction method, which is widely used. Although the shield method construction has little disturbance to the overlying soil, it still inevitably disturbs the surrounding soil, and then causes the deformation of the soil, which leads to a series of environmental engineering problems. In this paper, the method of calculating the deformation of soil and the settlement of buildings caused by shield tunneling is studied by means of theoretical analysis and measured analysis. The main innovations of this paper are as follows: (1) the deformation of soil caused by shield tunnel construction mainly includes: 1) modifying the two-dimensional solution formula of unified soil movement model of shield tunneling. The modified formula is used to predict the total land subsidence caused by the parallel shield construction. This method is suitable for the short distance working condition of double track tunnel, so the definition formula of close distance is studied. 2) considering the action of many factors (soil loss, frontal additional thrust, shield shell friction, additional grouting force), A mechanical calculation model was established to study the calculation method of soil deformation caused by double line horizontal and parallel shield construction. Because the deviation b of the settlement trough of the rear tunnel can reflect the influence of the tunnel excavation on the construction of the tunnel, the statistical results of 21 measured data of 5 cases are analyzed. And the value of b value has been studied. (2) the settlement of the building caused by shield tunnel construction mainly includes: 1) when the shield tunneling works through the upper existing buildings, there is obvious difference between the settlement trough formed and the one without building. In this paper, the uniform soil movement model of shield tunneling is used to modify Ouyang Wenbiao's solution, considering the stiffness of building foundation, the depth of foundation and the asymmetry of soil settlement curve caused by tunnel construction. The two-dimensional solution is extended to the three-dimensional solution. At the same time, the post-construction settlement of the building is calculated. 2) assuming that the building is an elastic foundation beam, a practical method to predict the settlement curve of the building considering the influence of the building stiffness on the settlement of the building is put forward. According to the unified soil movement model, the ground settlement caused by shield construction without consideration of buildings is calculated, and then the ground settlement is converted into the settlement reaction force acting on the elastic foundation beam according to the elastic foundation beam theory. The settlement reaction force is applied to the beam on the elastic foundation by MIDAS-GEN finite element software. Finally, the settlement value of the building considering the stiffness of the building is calculated. The method is verified by three engineering examples, and the influence of the relative relationship between the tunnel and the building position, the coefficient k of the foundation bed and the stiffness of the building EI on the settlement of the building is analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43;TU433
本文编号：2313419
[Abstract]:In the construction of underground space, shield method is an indispensable construction method, which is widely used. Although the shield method construction has little disturbance to the overlying soil, it still inevitably disturbs the surrounding soil, and then causes the deformation of the soil, which leads to a series of environmental engineering problems. In this paper, the method of calculating the deformation of soil and the settlement of buildings caused by shield tunneling is studied by means of theoretical analysis and measured analysis. The main innovations of this paper are as follows: (1) the deformation of soil caused by shield tunnel construction mainly includes: 1) modifying the two-dimensional solution formula of unified soil movement model of shield tunneling. The modified formula is used to predict the total land subsidence caused by the parallel shield construction. This method is suitable for the short distance working condition of double track tunnel, so the definition formula of close distance is studied. 2) considering the action of many factors (soil loss, frontal additional thrust, shield shell friction, additional grouting force), A mechanical calculation model was established to study the calculation method of soil deformation caused by double line horizontal and parallel shield construction. Because the deviation b of the settlement trough of the rear tunnel can reflect the influence of the tunnel excavation on the construction of the tunnel, the statistical results of 21 measured data of 5 cases are analyzed. And the value of b value has been studied. (2) the settlement of the building caused by shield tunnel construction mainly includes: 1) when the shield tunneling works through the upper existing buildings, there is obvious difference between the settlement trough formed and the one without building. In this paper, the uniform soil movement model of shield tunneling is used to modify Ouyang Wenbiao's solution, considering the stiffness of building foundation, the depth of foundation and the asymmetry of soil settlement curve caused by tunnel construction. The two-dimensional solution is extended to the three-dimensional solution. At the same time, the post-construction settlement of the building is calculated. 2) assuming that the building is an elastic foundation beam, a practical method to predict the settlement curve of the building considering the influence of the building stiffness on the settlement of the building is put forward. According to the unified soil movement model, the ground settlement caused by shield construction without consideration of buildings is calculated, and then the ground settlement is converted into the settlement reaction force acting on the elastic foundation beam according to the elastic foundation beam theory. The settlement reaction force is applied to the beam on the elastic foundation by MIDAS-GEN finite element software. Finally, the settlement value of the building considering the stiffness of the building is calculated. The method is verified by three engineering examples, and the influence of the relative relationship between the tunnel and the building position, the coefficient k of the foundation bed and the stiffness of the building EI on the settlement of the building is analyzed.
【学位授予单位】：浙江大学
【学位级别】：硕士
【学位授予年份】：2017
【分类号】：U455.43;TU433
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